JP2010127464A - Method for bending flexible hose for city water - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To bend and retain a flexible hose including a mesh-like cylindrical body that is a resin outer pipe as an external cover-protection material and a flexible resin inner pipe inserted into the cylindrical body in its longitudinal direction (axial direction), and stationarily maintain the bent part. <P>SOLUTION: In the method for bending a flexible hose including a soft resin inner tube to be arranged longitudinally and a resin outer pipe that is the mesh-like cylindrical body into which the resin inner pipe is inserted, after a completed product of the flexible hose is obtained by fixing metallic joint members respectively to both ends of the flexible hose, a predetermined position in the longitudinal direction (axial direction) of the flexible hose that is the completed product is bent in a desired direction, the bent part of the flexible hose is heated, and the flexible hose is cooled after heating, whereby the bent part of the flexible hose is retained, and stationarily maintained. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention provides a flexible hose formed by externally fitting a cage-shaped cylinder, which is a resin-made outer tube, as a covering / protecting material, and inserting a flexible resin-made inner tube into the cage-shaped cylinder. The present invention relates to a method for bending and forming a flexible hose for water supply that can be bent and held in the axial direction and can be maintained and fixed.

  Conventionally, the outer tube of a cage-shaped cylinder formed of rubber or resin is fitted as a covering / protecting material, and the flexible tube molded of rubber or resin inside the cage-shaped cylinder A flexible hose inserted through a flexible hose is known in the following patent documents.

  For example, Patent Document 1 discloses a vehicle protector that can be suitably used for water hoses such as engine rooms and heater hoses.

  According to this patent document 1, as a vehicle protector that can be easily attached to a vehicle hose and obtained economically, a thermoplastic elastomer is used as a material, and a thread-like protector element is extruded from a rotating mandrel inside and outside to form a net shape. A cylindrical mesh protector obtained by welding the intersections of meshes by extrusion heat while being combined is obtained, and this mesh protector is inserted into the outer surface of the vehicle hose and is elastically attached to the protective part. Yes. That is, a configuration is disclosed in which an outer tube that is a cage-shaped cylinder is externally fitted as a covering / protecting material, and a flexible hose is inserted inside the cage-shaped cylinder.

  Further, Patent Document 2 relates to a kink-preventing pressure-resistant flexible hose in which a cage-like cylindrical body made of a braided layer of a resin monofilament having a wire diameter exceeding 1 mm is provided on a flexible resin inner tube without substantially bonding. Are disclosed.

  According to the procedural amendment of Patent Document 2, when the fiber is left in air at 210 ° C. for 60 minutes on an inner tube made of either rubber, thermoplastic elastomer, or soft resin, the fine diameter exceeds 1 mm. A hose provided with a basket-like cylinder made of a braided layer of polyester resin monofilament having a heat shrinkage of 10% or less, and when the hose is bent, the inner tube and the basket-like cylinder slide against each other. It is claimed to be configured as a kink-proof pressure-resistant flexible hose that is in a state and exists without the monofilaments being welded together. That is, a configuration is disclosed in which an outer tube that is a cage-shaped cylinder is externally fitted as a covering / protecting material, and a flexible hose is inserted inside the cage-shaped cylinder.

  Furthermore, Patent Document 3 has excellent kink generation prevention and pressure resistance, and the generation of kinks is suppressed at the connection portion between the hose and the connecting part, and the hose can be easily disposed at the time of disposal after use. The liquid hose which can be classified according to the constituent materials is disclosed.

  According to this Patent Document 3, a cage-like cylindrical body braided without adhering between resin monofilaments is formed on a resin inner tube on the end of a hose that is coated without substantially adhering to the inner tube. In the flexible hose for feeding liquid to which the connection parts are attached, the end of the hose is sandwiched between the crimped outer cylinder over the hose and the connection part in which the tip is inserted inside the hose inner pipe, The connection parts, the inner tube, and the squirrel-cylinder are clamped by the caulking outer cylinder, so that they are fixed and can be easily separated according to the constituent material of the hose when discarded after use. It is said that. In other words, the outer tube which is a cage-shaped cylinder is externally fitted as a covering / protecting material, and a flexible hose is inserted inside the cage-shaped cylinder, and at the time of disposal after use, it can be easily separated A configuration that can be sorted is disclosed.

  In Patent Document 4, various joint members made of metal are appropriately piped and connected between both ends of a flexible hose which is a resin pipe having sufficient flexibility while protecting the pipe from interference of other members. The thing which concerns on the buried piping structure made into the flexible hose for waterworks to perform is disclosed.

  According to this Patent Document 4, a flexible hose is formed by covering a resin outer tube of a cage-like cylindrical body braided without adhering the strands of resin monofilament while inserting a flexible resin inner tube. And between the both ends of the flexible hose, a pipe is fitted on the outer periphery to fix the pressure indentation, and an inner hose nipple mounting portion is fitted to the inner periphery and fixed by pressure deformation. It is comprised as a buried piping structure by the flexible hose for waterworks which connects various joint members between the both ends of the said flexible hose, interposing suitably in a buried piping structure. That is, a flexible hose for waterworks in which an outer tube that is a cage-shaped cylinder is externally fitted as a covering / protecting material, and a flexible hose is inserted inside the cage-shaped cylinder, and a caulking joint member is connected to both ends. Are disclosed.

JP 2001-99389 A JP 2003-4175 JP 2007-127235 A JP 2008-25323 A

  As described above, according to Patent Documents 1 to 4, a basket-like cylinder formed from rubber or resin is used as a covering / protecting material, and the inside of the basket-like cylinder is molded from rubber or resin. Because it is configured to be inserted through a flexible flexible hose, it is lightweight, has flexibility (flexibility), and has an effect such as excellent pressure resistance such as load when buried in the ground and excellent kink prevention In addition, various proposals have been made on how to easily separate the constituent materials and how to configure both ends.

  However, since resin hoses such as polyethylene resin are somewhat rigid as flexible tubes, they can be used as a long series of flexible hoses that extend in the longitudinal direction (axial direction), but water supply piping that requires flexibility There is a problem that it cannot be used well. Furthermore, it is still difficult to mold the flexible hose itself so as to maintain and fix the bending of the flexible hose itself.

  The present invention has been made based on such circumstances, and the object of the present invention is to externally fit a resin outer tube, which is a resin-made cage-shaped cylinder, as a covering / protecting material. Proposing a bending method of flexible hose for water supply that allows holding a flexible hose formed by inserting a flexible resin inner tube into the body and maintaining and fixing a predetermined portion in the longitudinal direction (axial direction) is there.

  In order to achieve the above object, according to the present invention, as described in claim 1, a flexible resin inner tube arranged in the longitudinal direction and a cage shape inserted through the resin inner tube by external fitting In a bending method of a flexible hose comprising a resin outer tube that is a cylindrical body, a metal joint member is fixed to both ends of the flexible hose to obtain a finished product of the flexible hose. The predetermined portion in the longitudinal direction (axial direction) of the flexible hose is bent in a desired direction, the bent portion of the flexible hose is heated, and the flexible hose is heated and then cooled. It is characterized in that the bent portion is held and maintained and fixed. In addition, as described in claim 2, the holding of the bent portion is processed in the range of the hot water temperature 82 ° C.> 100 ° C., and the maintenance and immobilization is sharply processed in the range of water cooling 0 ° C. or less. It is characterized by.

According to this invention, the flexible hose of the resin outer tube which is a cage-like cylindrical body through which the resin inner tube is inserted is lightweight and flexible, and forms a hose that is excellent in pressure resistance such as a load at the time of embedding. In addition, metal joint members are fixed to both ends of the flexible hose, and the finished product is finished. However, both ends of the flexible hose are fixed and formed when the flexible hose is bent and maintained and fixed. Since the bent portion can be heated as it is in the finished product, and after being heated, it can be cooled and processed, so that it is possible to easily hold the bent portion of the flexible hose and to maintain and fix it.
Further, according to the invention described in claim 2, in addition to the above effects, the treatment can be performed by hot water temperature and water cooling, so that the bent portion can be easily held and maintained and fixed at a lower cost.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is an external view showing a case where the flexible hose for water supply is bent and maintained and fixed, FIG. 2 is an explanatory view for explaining the molded state of FIG. 1, and FIGS. It is a longitudinal cross-sectional view which shows the shaping | molding state of FIG.

  As shown in FIG. 7, the flexible hose for water supply is composed of a resin outer tube 3 which is inserted through a flexible resin inner tube 2 arranged in the longitudinal direction and whose outer fitting is covered as a covering / protecting material. It is composed of joint members 6 and 6 which are formed as heavy pipes and are fixed to both ends thereof, and are combined and fixed to each other to form a finished product as a whole.

  More specifically, the flexible flexible hose 1 extending in the longitudinal direction has a resin inner tube 2 inserted inside, and an outer fitting of the resin inner tube 2 without being bonded between the strands of the resin monofilament 3b. It consists of a resin outer tube 3 of a braided cage-shaped cylinder 3a. Further, both end portions of the flexible hose 1 are sandwiched between a crimped outer cylinder 4 covered on the outer peripheral portion of the resin outer tube 3 and a nipple fitting 5 inserted in the inner peripheral portion of the resin inner tube 2, It is set as the structure crimped by the joint members 6 and 6 of various shapes which are hose end metal fittings (refer FIG. 8).

  The inner resin inner tube 2 forming the flexible hose 1 is made of a thermoplastic resin, and examples thereof include various rubbers and various thermoplastic elastomers (TPE). The resin inner tube 2 shown in this embodiment is molded from polyvinyl chloride (PVC). As is well known, the melting point of polyvinyl chloride is 180 ° C., and the glass transition point is 82 ° C. Has been. That is, in polyvinyl chloride, “the melting point is 180 ° C. or lower and the glass transition point is 82 ° C. or higher” is “the temperature at which it does not melt but is easily deformed”.

  The outer resin outer tube 3 forming the flexible hose 1 is made of a thermoplastic resin and includes various rubbers and various thermoplastic elastomers (TPE). The resin outer tube 3 shown in this example is made of polyethylene terephthalate (PET). As is well known, the melting point of polyethylene terephthalate is 260 ° C., and the glass transition point is 68 ° C. or 81 ° C. It is said that. That is, in polyethylene terephthalate, “the range of melting point of 260 ° C. or lower and glass transition point of 68 ° C. or 81 ° C. or higher” is “temperature that does not melt but is easily deformed”.

  The cage-like cylindrical body 3a which is the resin outer tube 3 does not hinder the expansion and contraction of the cage-like cylindrical body 3a when the hose is bent, and exhibits a kink prevention function by absorbing the deviation from the resin inner tube 2. It is. Moreover, the braided cage-shaped cylinder 3a in which the strands of the resin monofilament 3b are not bonded has resilience to such an extent that the cage-shaped cylinder 3a can be formed, and the joint members 6 at both ends are provided. , 6, the resin outer tube 3, and the resin inner tube 2 can be separately collected, so that the finished product is highly recyclable.

  Next, in the case where the desired flexible portion of the flexible hose for water supply in which the resin inner pipe 2, the resin outer pipe 3, and the joint members 6 and 6 are finished products is bent freely as shown in FIGS. This will be explained based on. In this embodiment, the resin inner tube 2, the resin outer tube 3, the joint members 6, 6 have been described as a three-piece double tube, but only the flexible hose 1 of the resin inner tube 2 and the resin outer tube 3 is used. Of course, it may be applied to.

First, as described above, when both the members in the resin inner tube 2 and the resin outer tube 3 constituting the flexible hose 1 are bent and maintained and fixed, the following is confirmed.
(1) The inner tube 2 made of polyvinyl chloride (PVC) has a “melting point of 180 ° C. or lower and a glass transition point of 82 ° C. or higher” that is “a temperature that does not melt but is easily deformed”. .
(2) The resin outer tube 3 which is an outer polyethylene terephthalate (PET) has a “melting point of 260 ° C. or lower and a glass transition point of 68 ° C. or 81 ° C. or higher” “a temperature that does not melt but is easily deformed” It is.
That is, it is preferable that the bent portions of both members are held within a range of 82 ° C.> 100 ° C., and the maintenance fixation is solidified within a range of 0 ° C. or less.

  Therefore, in forming the bent portion, as shown in FIG. The flexible hose for water supply is bent at the portions of the flexible hose 1 (resin inner tube 2, resin outer tube 3) except for the joint members 6 and 6 at both ends.

  This bending operation may be performed manually or using a bending tool (see FIG. 2). For example, the bending portion of the flexible hose 1 (resin inner tube 2, resin outer tube 3) is sandwiched between a pair of vertically erected pipes 7, and “bending smoothing” is performed. At this time, a holding tube is inserted as a core material 8 into the resin inner tube 2 of the flexible hose 1 so that the flexible hose 1 is not crushed. Further, the bending tool 9 is formed by a pair of upper and lower box-shaped housings 91 and 92 having holes 91a and 92a through which the flexible hose 1 is inserted on the side surface, so that the later work described later of the flexible hose 1 can be easily performed. It may be.

  Next, the second step “heat treatment” is performed to heat the flexible hose 1. This heat treatment is usually performed by hot water temperature. The hot water temperature is set in consideration of the optimum bending condition of the resin inner tube 2 and the resin outer tube 3 as described above. That is, it is processed as a hot water temperature “range of 85 ° C. or more and 100 ° C. or less”.

  Next, the “bending maintenance process” of the third step is performed, and the bending portion of the flexible hose 1 is molded and held for a required time. Next, a “steep cooling process” is performed as the fourth step, the steep cooling of the bent portion of the flexible hose 1 is performed, and the bent portion is maintained and fixed. In this steep cooling, the cooling process is performed steeply with water cooling of 0 ° C. or less. In order to stop the movement of the molecules of polyvinyl chloride and polyethylene terephthalate and to fix the resin of polyvinyl chloride and polyethylene terephthalate, the cooling process needs to be steep, and the curing time is about 30 minutes. is required.

  Next, as a “maintenance and fixing process” in the fifth step, molding is maintained and fixed at the bent portion of the flexible hose 1 for a required time.

  The heating means may be performed by irradiation means such as far-infrared rays regardless of the hot water temperature, may be other heating means, and any other necessary cooling means can be selected.

  In this way, the flexible hose for water supply is in a state in which the joint members 6 and 6 at both ends are in a finished product with the hose end fittings, that is, in a state where the flexible hose for water supply is not disassembled. A portion of the flexible hose 1 is bent at a predetermined position in the longitudinal direction (axial direction) in a desired flexible direction, and the bent portion is heated, cooled after being heated, and held and maintained at the bent portion. Is. Further, the holding of the bent portion is processed in the range of the hot water temperature 82 ° C.> 100 ° C., and the maintenance immobilization is sharply processed in the range of water cooling 0 ° C. or less.

  Next, a second embodiment will be described. First, the flexible hose 1 (resin inner tube 2, resin outer tube 3) is set in the bending die 10. The bending die 10 sandwiches an intermediate portion of the flexible hose 1 between the upper and lower dies 11a and 11b, but a cavity portion, which is a half-shaped cavity 111a and 111b, is formed on the joint surface of the upper and lower dies 11a and 11b. The flexible hose 1 is formed to have a desired bent shape.

  Therefore, the flexible hose 1 including the resin inner tube 2 and the resin outer tube 3 is flexibly flexible and bent along the cavities 111a and 111b of the cavity portion of the bending mold 10 (upper and lower molds 11a and 11b). (See FIG. 6). A holding tube is inserted into the cavities 111a and 111b as the core material 8 so that the flexible hose 1 is not crushed by a thermosetting resin or the like.

As described above, according to this embodiment, the flexible hose for water supply can be used as a hose that requires pressure resistance and kink prevention, and is particularly suitable for water supply because flexibility is required for earthquake countermeasures. is there. In addition, the cage-like cylinder is lightweight and flexible, and has excellent pressure resistance such as a load at the time of embedding, and is flexible and has excellent workability and handling properties as compared with those made of metal. Furthermore, since the joint member of various specifications is selectively attached to the end portion of the hose, a reliable end portion is formed, the handling property is remarkably excellent, and the kink prevention property is excellent.
Moreover, since the bent portion can be held and maintained and fixed by hot water or water cooling, it can be easily and inexpensively performed.

FIG. 1 is an external view showing the case where the flexible hose for water supply is bent and maintained and fixed. It is explanatory drawing explaining the shaping | molding state of FIG. It is a longitudinal cross-sectional view which shows the shaping | molding state of FIG. It is a figure which shows the formation process of this invention. It is schematic description which shows a 2nd Example. It is a longitudinal cross-sectional view in FIG. It is an external view which shows the flexible hose for water supply of this invention. It is a schematic principal part enlarged view which shows the edge part of the flexible hose for waterworks.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Flexible hose 2 Resin inner pipe 3 Resin outer pipe 3a Cage-like cylinder 3b Resin monofilament 4 Clamping outer cylinder 5 Nipple metal fitting 6 Joint member 7 Pipe 8 Core material 10 Bending type

Claims (2)

In a bending method of a flexible hose comprising a flexible resin inner tube arranged in the longitudinal direction and a resin outer tube that is a cage-like cylindrical body that is externally fitted and inserted through the resin inner tube,
After securing a metal joint member to both ends of the flexible hose to obtain a finished product of the flexible hose,
Bending a predetermined portion in the longitudinal direction (axial direction) of the flexible hose that is a finished product in a desired direction, heating the bent portion of the flexible hose, and cooling the flexible hose after heating, A method for bending and forming a flexible hose for water supply, characterized in that the bent portion of the flexible hose is held and maintained and fixed.   2. The water supply according to claim 1, wherein the holding of the bent portion is processed in a range of hot water temperature 82 ° C.> 100 ° C., and the maintenance and immobilization thereof is sharply processed in a range of water cooling 0 ° C. or less. Bending method for flexible hose.

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